The last one didn't get my changes or thiago's
Single negative applied to a combination joined by or.
The last one didn't get either my changes or thiago's
As above, but using either to make it clearer what the or is joining.
The last one got neither my changes nor thiago's
Made negative by neither...nor.
The last one didn't get either of my or thiago's changes.
The last one got neither of my nor thiago's changes.
Another approach to the same thing, using either...or and neither...nor slightly differently.
The last one didn't get my changes, nor thiago's.
Nor used without neither. This is rarer, though it can happen when speaking because you add it as an afterthought.
Note that all of these variants either use didn't or use neither, but none of them use both as yours did.